Changes in the concentrations and transcripts for gibberellins and other hormones in a growing leaf and roots of wheat seedlings in response to water restriction

Ptošková K., Szecowka M., Jaworek P., Tarkowská D., Petřík I., Pavlović I., Novák O., Thomas S.G., Phillips A.L., Hedden P.
BMC PLANT BIOLOGY 22: 284, 2022

Keywords: Drought, gene expression, gibberellins, plant hormones, wheat
Abstract: Bread wheat (Triticum aestivum) is a major source of nutrition globally, but yields can be seriously compromised by water limitation. Redistribution of growth between shoots and roots is a common response to drought, promoting plant survival, but reducing yield. Gibberellins (GAs) are necessary for shoot and root elongation, but roots maintain growth at lower GA concentrations compared with shoots, making GA a suitable hormone for mediating this growth redistribution. In this study, the effect of progressive drought on GA content was determined in the base of the 4th leaf and root tips of wheat seedlings, containing the growing regions, as well as in the remaining leaf and root tissues. In addition, the contents of other selected hormones known to be involved in stress responses were determined. Transcriptome analysis was performed on equivalent tissues and drought-associated differential expression was determined for hormone-related genes.
DOI: 10.1186/s12870-022-03667-w IEB authors: Peter Hedden, Pavel Jaworek, Ivan Petřík, Marek Szecówka, Danuše Tarkowská